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Yu Y.S.,Wuhan Institute of Geology and Mineral Resources | Yu Y.S.,Chinese Academy of Geological Sciences | Gao Y.,Jiangxi Institute of Geology Survey | Yang Z.S.,Chinese Academy of Geological Sciences | And 5 more authors.
Acta Petrologica Sinica | Year: 2011

Whole-rock major and trace elements, zircon LA-ICP-MS U-Pb age of granooliorite and monzogranite from Gunjiu iron deposit in the Nixiong ore field, which are associated with the Fe mineralization, are analyzed in this paper. The major elements result show that both rocks are enriched in silica and alkali (with the average of SiO2, 66.76%, 70.98% and ALK 6.28%, 7.70%). The aluminum saturation index are both less than 1.1. The rocks are belonged to medium-high k. calc-alkaline 1-type granite. There have similar chondrite-normalized REE patterns and primitive mantle normalized trace element spectrum, low Σ RLE (130.6 × 10-6 and 134.3 × 10-6) and high δEu (0. 84 and 0. 88), with (La/Yb)N value of 8. 07 and 6. 72. Both rocks are enriched in LILEs (Rb, k, Pb, 'Hi) and LREE, depleted in Ba and HFSEs (U, Nb, Ta, P, Ti). The geochemistry results show characteristic of arc volcanic rock; it also indicated that both rocks were formed from a mixed magma between the partial melting materials of the upper crust and asthenospheric mantle in the extensional environment. Zircon LA-ICP-MS U-Pb dating for both rocks yields the age of 113. 6 ± 1.2Ma and 112. 6 ± 1.6Ma, which indicate that there were formed in later of Lower Cretaceous. Combined with the data of regional geology, the authors have the opinion that the granodiorite and monzogranite of Gunjiu iron deposit are related to the southward subduction of Bangong Co-Nujiang Ocean crust. In about ∼ 113Ma, the Gangdese and the Qiangtang continental crust start to collision. The subducted oceanic crust of Bangong Co-Nujiang occurred to rotary, which leading asthenospheric fluids upwelling. The tremendous heat of asthenospheric fluids caused partial melting of the lithospheric mantle and the overlying crustal and to formed mixed magma, which intruded above in the back-arc extensional condition and formed the granodiorite and monzogranite. Source


Chen Y.,Jiangxi Institute of Geology Survey | Xu P.,Jiangxi Institute of Geology Survey
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

The spatial and spectral resolution of ASTER data has been greatly improved much more than the common ETM data. ASTER Remote sensing data have a good prospect in the abnormal alteration mineral extraction. This paper studies the ore prospect in Chengmenshan of the JiuJiang district, JiangXi Province. According to the spectral features of common alteration mineral on metal deposits and the ASTER band characteristics, using ASTER Multi-spectrum data can calculate the RBD of limonitization and hydroxide radical mineral. Extracting remote sensing anomaly in Chengmenshan combine RBD with Principal component method, and contrasted with the geologic information, the results show that extract and process data-processing techniques are more reliable. © 2011 SPIE. Source

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